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AWS Solutions Architect Solutions Architect Interview

Core AWS services, the Well-Architected Framework and a live architecture design round — trade-offs decide the level.

Professional role Global Web-verified 2026-08
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A free AI panel interview that questions you in AWS Solutions Architect’s style, follows up when an answer is thin, and returns a scored, evidence-backed report — seeded from your own practice history on Wrexa Edge.

5Interview rounds
10Key topics
3Practice modes
FreeAI mock interview

The AWS Solutions Architect interview, in brief

A Solutions Architect interview goes well beyond the SAA-C03 certification syllabus: the cert proves you know the services, but the job interview proves you can architect with them. Interviewers probe core AWS building blocks (EC2, S3, VPC, IAM, RDS, Lambda, CloudFront, Route 53), then hand you an open-ended scenario and watch how you gather requirements, choose services, and — most importantly — articulate trade-offs across the five Well-Architected pillars. The single biggest differentiator between junior and senior candidates is the ability to reason about trade-offs out loud: availability vs cost, managed vs self-managed, consistency vs latency. Naming a service is table stakes; justifying it against alternatives is the signal.

A typical loop opens with a recruiter screen, then a technical screen on AWS fundamentals and your hands-on experience. The centrepiece is one or more architecture/scenario rounds: you are given a business problem (a scalable web app, a data pipeline, a DR strategy) and asked to design it on a whiteboard, defending each decision. Expect deep dives on high availability across Availability Zones, security (IAM least privilege, encryption), cost optimisation, and disaster recovery. A behavioural round is standard — and at Amazon itself, it is explicitly structured around the Leadership Principles.

Interview rounds

  • Recruiter screen 20-30 min · non-technical
    Background, depth of AWS experience, certifications, level, and logistics.
  • Technical screen 45-60 min
    Core services (EC2, S3, VPC, IAM, RDS, Lambda), networking, and how you have used them in real projects.
  • Architecture / design round 45-60 min · whiteboard
    Design a system to a business brief; defend service choices, HA, security, cost, and scaling trade-offs.
  • Scenario / troubleshooting deep-dive 45-60 min
    DR strategy, cost reduction on a running workload, or diagnosing a performance/security gap in a given design.
  • Behavioural round 45-60 min · STAR
    Stakeholder influence, ownership, and (at Amazon) the Leadership Principles with specific examples.

Coding & DSA topics

Compute: EC2, Auto Scaling, LambdaStorage: S3, EBS, lifecycle policiesNetworking: VPC, subnets, security groupsIAM: roles, policies, least privilegeDatabases: RDS, DynamoDB, read replicasContent delivery: CloudFront & Route 53Well-Architected Framework (5 pillars)High availability & multi-AZ / multi-region DRCost optimisation (Reserved/Savings/Spot)Security: encryption, KMS, MFA

System design

The architecture/design round is the heart of the interview. You are handed a deliberately under-specified brief — "design a highly available e-commerce backend", "build a DR strategy for a critical database", "cut the cost of this data-transfer-heavy workload" — and expected to drive it like a consultant. Start by eliciting requirements (traffic, RTO/RPO, budget, compliance), then sketch the architecture: multi-AZ compute behind an ALB with Auto Scaling, Route 53 for DNS and failover routing, CloudFront to cache at the edge and cut data-transfer cost, RDS with Multi-AZ and cross-region read replicas or S3 cross-region replication for DR, and IAM least-privilege throughout. The interviewer will pressure-test every choice against the Well-Architected pillars: is this the cheapest way to meet the SLA? What fails if an AZ goes down? Where is the data encrypted? Strong candidates quantify (active-active gives seconds-level RTO but doubles cost; pilot-light is cheaper but slower) and never present a design as though it had no downsides.

Behavioural round

Architects must influence without owning the codebase, so interviewers assess stakeholder communication, ownership of outcomes, and the ability to translate business requirements into technical decisions and back again. Customer obsession, dealing with ambiguity, and defending a recommendation while staying open to better ideas all feature. At Amazon specifically the behavioural round maps directly to the Leadership Principles — prepare STAR stories with metrics.

Representative question categories

Patterns in AWS Solutions Architect’s style — not verbatim proprietary questions.

  • High availability designDesign a web app that survives an Availability Zone failure with no downtime.
  • Disaster recoveryChoose between active-active, pilot-light and backup-restore for a given RTO/RPO.
  • Cost optimisationReduce the cost of a data-transfer-heavy workload without hurting performance.
  • Security & IAMApply least privilege, encryption, and MFA to a multi-account setup.
  • Networking (VPC)Lay out public/private subnets, NAT, and security groups for a three-tier app.
  • Well-Architected trade-offsWhere does your design trade cost for reliability, and why is that acceptable?

How to prepare

Do

  • Always state trade-offs explicitly and tie them to a Well-Architected pillar — this is the top junior-vs-senior differentiator.
  • Gather requirements before designing: ask about traffic, RTO/RPO, budget, and compliance so your architecture is justified.
  • Default to managed and multi-AZ services, and be ready to explain when you would NOT (cost, control, or latency reasons).
  • Quantify DR and cost options (active-active vs pilot-light vs backup-restore; Reserved vs Spot) rather than naming one answer.

Avoid

  • Listing services without justifying them or acknowledging any downside — every architecture has trade-offs.
  • Designing before clarifying requirements, then building something over- or under-engineered for the actual need.
  • Treating the interview as a cert-exam recall test instead of a consulting conversation about a real business problem.

Who can apply

Employers typically expect hands-on AWS experience and often the Solutions Architect Associate (SAA-C03) certification, with the Professional level valued for senior roles. A cloud, systems, or software background helps; a specific degree is not universally required. Depth of real architectural experience usually outweighs the certification alone. Requirements vary by employer and level.

AWS Solutions Architect interview FAQ

Is the AWS Solutions Architect interview the same as the SAA-C03 exam?
No. The SAA-C03 certification is a multiple-choice exam that proves service knowledge; the job interview uses that knowledge as a baseline and adds live architecture-design rounds, scenario deep-dives, and behavioural questions where you must justify trade-offs, not just recall facts.
What is the most important skill in an AWS architect interview?
Articulating trade-offs. Interviewers consistently say the biggest gap between junior and senior candidates is whether you can reason out loud about availability vs cost, managed vs self-managed, and consistency vs latency — ideally framed against the Well-Architected pillars.
What AWS services should I know for a solutions architect interview?
Core building blocks: EC2 and Auto Scaling, S3, VPC and subnets, IAM, RDS and DynamoDB, Lambda, CloudFront, and Route 53 — plus the five Well-Architected pillars and patterns for high availability, disaster recovery, security, and cost optimisation.
What does the architecture design round involve?
You are given an under-specified business brief and asked to design a solution on a whiteboard: gather requirements, choose services, and defend each decision against high availability, security, cost, and DR. The interviewer pressure-tests trade-offs, so quantify options rather than presenting one answer as flawless.

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Wrexa Edge is an independent exam-prep platform and is not affiliated with, authorised by, or endorsed by AWS Solutions Architect. This guide is based on publicly documented interview practice; it does not reproduce any employer’s internal rubric or question bank, and it does not predict a hiring outcome.